US7408696B2 - Three-dimensional electrophoretic displays - Google Patents
Three-dimensional electrophoretic displays Download PDFInfo
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- US7408696B2 US7408696B2 US10/841,122 US84112204A US7408696B2 US 7408696 B2 US7408696 B2 US 7408696B2 US 84112204 A US84112204 A US 84112204A US 7408696 B2 US7408696 B2 US 7408696B2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133377—Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
Definitions
- This invention relates to three-dimensional electrophoretic displays comprising individually sealed cells filled with an electrophoretic dispersion which may be an optically active electrophoretic dispersion.
- This invention more particularly relates to bi-stable, low-power-consumption and sealed microcup-based electrophoretic displays for high-quality three-dimensional imagery applications.
- 3-D three-dimensional
- stereoscopic three-dimensional
- still or motion images for broadcasting, entertainment, scientific research, engineering design, medical or military applications.
- 3-D three-dimensional
- many such conventional techniques call for the use of two camera systems, whereby two different images are taken from slightly different camera angles and locations, so as to simulate the process by which depth is perceived by a pair of eyes separated by the inter-pupil distance.
- the two images are then superimposed, either before or after transmission, and finally displayed on a display apparatus such as a television or screen.
- the two superimposed images are somehow “separated” in the eyes of the viewer, such that one eye sees only one image while the other eye sees only the other image, and as a result an illusion of depth is created by simulating normal human vision.
- a popular conventional technique for generating and displaying 3-D images is the anaglyphic 3-D process.
- this technique uses color filters, in the form of a pair of colored glasses worn by the viewer, to separate the two images respectively presented to the right and left eyes. Simultaneously, watching the breakdown images with the right eye and the left eye can give the image a three-dimensional look.
- An example of the anaglyphic process is described in U.S. Pat. No. 3,697,679, entitled “Stereoscopic Television System” and issued to T. Beard, et al.
- Polaroid process Another conventional process is the so-called Polaroid process, in which the right and left images are separated by the use of polarized light filters.
- the right eye image is projected onto a screen through a polarizing filter rotated 45° to the right of vertical, while the left eye image is projected onto the same screen through a polarizing filter rotated 45° to the left of vertical.
- polarized filters are placed in front of each of the eyes of the viewer, causing the proper image to be transmitted to each eye.
- a more recent technique for viewing 3-D images is to make the viewer wear a pair of spectacles incorporating liquid crystal shutters.
- the image on the display alternates between a right-eye view and a left-eye view in a time-multiplexed fashion. If the image is synchronized with the spectacle shutters at a sufficient rate, the viewer can see a flicker-free stereoscopic image.
- a liquid crystal shutter may also be disposed in front of a display apparatus while the viewer uses a pair of polarized glasses to view the images. As an example, this is disclosed in U.S. Pat. No. 6,252,624 B1, entitled “Three Dimensional Display” and issued to K. Yuasa, et al.
- the right and left perspective images of a 3-D video display system may also be spatially multiplexed during the image generation process to produce a multiplexed composite image.
- the visible light associated with the right and left perspective image components of the composite image are simultaneously displayed, yet with spatially different polarizations.
- This perspective image blocking or selective viewing process is typically achieved by the use of spectacles incorporating a pair of spatially different polarizing lenses.
- micropolarizers may be mounted onto the display surfaces to emanate the polarized light of spatially multiplexed images.
- Another prior-art 3-D image display system makes use of the spectral properties of both right and left perspective color images and ensures that the right eye of the viewer sees only the right perspective color images and the left eye of the viewer sees only the left perspective color images of a 3-D scenery.
- U.S. Pat. No. 4,995,718, entitled “Full Color Three-Dimensional Projection Display” and issued to K. Jachimowicz, et al. teaches a display system that includes three monochrome image sources and utilizes image polarization for color multiplexing.
- An EPD is a non-emissive device based on the electrophoresis phenomenon in which charged pigment particles suspended in a dielectric solvent are influenced by a pair of electrodes.
- An EPD typically comprises a pair of opposed, spaced-apart, plate-like electrodes, with spacers predetermining a certain distance between the electrodes. At least one of the electrodes, typically on the viewing side, is transparent. The viewing-side plate is usually the top plate.
- a passive-type EPD row and column electrodes on the top and bottom plates respectively are used to drive the displays, whereas an array of thin film transistors (“TFT”) on the bottom plate and a common, non-patterned transparent conductor plate on the top plate are required for the active type EPDs.
- TFT thin film transistor
- an electrophoretic fluid comprising a colored dielectric solvent and charged pigment particles dispersed therein, is enclosed between the two electrodes.
- An EPD operates as follows. A voltage difference is imposed between the two electrodes, causing the charged pigment particles to migrate to the plate of a polarity opposite that of the particles.
- the color shown at the top (transparent) plate can be either the color of the solvent or the color of the pigment particles. Reversal of the plate polarity will cause the particles to migrate in the opposite direction, thereby reversing the color shown at the top plate.
- intermediate color density (or shades of gray) due to intermediate pigment density at the transparent plate may be obtained by controlling the plate charge through a range of voltages.
- U.S. Pat. No. 06,184,856 entitled “Transmissive Electrophoretic Display with Laterally Adjacent Color Cells” and issued to J. G. Gordon II, et al., discloses a transmissive EPD comprising a backlight, color filters and substrates with two transparent electrodes. Each electrophoretic cell sandwiched between the two electrodes serves as a light valve. In the collected state, the particles in the cell are positioned to minimize the coverage of the horizontal area of the cell and allow the backlight to pass through the cell. In the distributed state, the particles are positioned to cover the horizontal area of the cell and scatter or absorb the backlight.
- PDAs personal digital assistants
- EPDs of different pixel or cell structures have been reported in the prior art; for example, M. A. Hopper and V. Novotny, in IEEE Trans. Electr. Dev ., 26(8):1148-1152 (1979), teaches a partition-type EPD; U.S. Pat. No. 5,961,804, entitled “Microencapsulated Electrophoretic Display” and issued to J. Jacobson, et al. and U.S. Pat. No. 5,930,026, entitled “Nonemissive Displays and Piezoelectric Power Supplies Therefor” and issued to J. Jacobson, et al., disclose a number of microencapsulated EPD devices. U.S. Pat. No.
- a partition-type EPD there are partitions between the two electrodes for dividing the space into smaller cells to prevent undesired movements of the particles such as sedimentation.
- difficulties are encountered in the formation of the partitions, the filling of the display with the fluid, the enclosure of the fluid in the display and the separation of electrophoretic fluids of different colors or polarization properties from each other.
- a full color or 3-D image presentation is thus impossible because of the lack of a mechanism to eliminate the undesirable cross-talk due to intermixing of components among the cells.
- the use of parallel line reservoirs such as microchannels, microgrooves or microcolumns to form the EPD device has the problem of undesirable particle sedimentation or creaming along the channel or groove direction.
- the pixel dimensions, particularly the length of the channels or grooves, are too long for an acceptable polarization or color separation for 3-D image or full color presentations, respectively.
- the lack of a seamless, air-pocket-free and continuous sealing process to enclose the electrophoretic fluid without undesirable intermixing or cross-talk makes the 3-D image or roll-to-roll manufacturing extremely difficult.
- the prior-art microencapsulated EPD devices have a substantially two-dimensional arrangement of microcapsules, each having therein an electrophoretic composition of a dielectric fluid and a dispersion of charged pigment particles that visually contrast with the dielectric solvent.
- the microcapsules are prepared in an aqueous solution and, to achieve a useful contrast ratio, have a relatively large size (i.e., 50-150 microns). This large microcapsule size results in a poor scratch resistance and a slow response time for a given voltage because of the relatively large inter-electrode gap dictated by the relative large capsules.
- the hydrophilic shell of microcapsules prepared in an aqueous solution typically results in sensitivity to high moisture and temperature conditions.
- the above-described sealed microcup structure enables a format flexible and efficient roll-to-roll continuous manufacturing process for the preparation of EPDs.
- the displays can be prepared on a continuous web of conductor film such as ITO/PET by (1) coating a radiation curable composition onto the ITO/PET film, (2) forming the microcup structure by a microembossing or photolithographic method, (3) filling the microcups with an electrophoretic fluid and sealing the filled microcups, (4) laminating the sealed microcups with the other conductor film and (5) slicing and cutting the display to a desirable size or format for assembling.
- conductor film such as ITO/PET
- microcup wall is in effect a built-in spacer to keep the top and bottom substrates apart at a fixed distance.
- the mechanical properties and structural integrity of microcup displays are significantly better than any prior-art displays including those manufactured by using spacer particles.
- displays involving microcups have desirable mechanical properties including reliable display performance when the display is bent, rolled or under compression pressure from, for example, a touch screen application.
- the use of the microcup technology also eliminates the need of an edge seal adhesive, which would limit and predefine the size of the display panel and confine the display fluid inside a predefined area. A conventional display prepared by the edge sealing adhesive method will no longer be functional if the display is cut or a hole is drilled through the display, because the display fluid would leak out.
- the display fluid within a sealed microcup-based display is enclosed and isolated in each cell.
- a sealed microcup-based display may be cut to almost any dimensions without the risk of damaging the display performance due to loss of display fluids in the active areas.
- the microcup structure enables a format flexible display manufacturing process, whereby a continuous output of displays may be produced, first in a large sheet format and then cut to any desired size and format.
- the individually sealed microcup or cell structure is particularly important when cells are filled with fluids of different specific properties such as colors, polarization, retardation and switching rates. Without the microcup structure and the seamless sealing processes, it would be very difficult to prevent the fluids in adjacent areas from intermixing or being subject to cross-talk in applications such as full color and 3-D presentations.
- Another object of the present invention is to provide a stereoscopic display apparatus and method having superior image qualities such as contrast ratio, color saturation, reflectivity, switching rate and resolution.
- Still another object of the present invention is to provide a reflective/transflective stereoscopic display that is thin, flexible and light weight.
- Yet another object of the present invention is to provide a stereoscopic display apparatus that is format and size flexible.
- a further object of the present invention is to provide a stereoscopic display that is durable, fault-tolerant and easy to maintain.
- Still a further object of the present invention is to provide a stereoscopic display that is bi-stable and of low power consumption, and requires low voltage to operate.
- Yet a further object of the present invention is to provide a stereoscopic display that can be manufactured by a roll-to-roll process at low cost.
- optically active electrophoretic fluids comprising right hand (R-) or left hand (L-) type of cholesteric liquid crystals (CLCs) or charged CLC pigment particles are used in adjacent microcups to selectively reflect only the R- or L-type of optically selective image to one of the viewer's eyes and simultaneously transmit only the mirror image to the viewer's other eye through a pair of viewing pieces having mirror circular polarizations. Simultaneously, watching the breakdown images gives the image a three-dimensional look.
- an optically active electrophoretic dispersion may comprise charged pigment particles dispersed in R- or L-type of optically selective CLCs that selectively reflects R- or L-type of light such as red (“R”), green (“G”) or blue (“B”) back to the viewer.
- an optically active electrophoretic dispersion may comprise charged R- or L-type of optically selective CLC pigment particles dispersed in a dielectric solvent.
- the optically selective CLC pigment particles selectively reflects R- or L-type of light such as “R”, “G” or “B” back to the viewer.
- These types of 3-D displays may have the traditional up/down, the in-plane or the dual switching mode.
- charged pigment particles are dispersed in a colorless dielectric solvent.
- An array of optically selective CLC color filter layers which selectively reflect R- or L-type of light such as “R”, “G” or “B” back to the viewer is attached to the electrophoretic cells.
- R- or L-type of light such as “R”, “G” or “B” back to the viewer is attached to the electrophoretic cells.
- plane switching circuitry is used in this particular embodiment.
- An advantage of the present invention is that the performance of the new stereoscopic display apparatus is not sensitive to viewing angle and environmental lighting condition.
- Another advantage of the present invention is that the new stereoscopic display apparatus and method can be made by either a continuous or batch process at low cost.
- FIG. 1 is a general schematic representation of several cells of a sealed microcup-based electrophoretic display apparatus.
- FIG. 2 is a schematic representation of several cells of a sealed microcup-based, color display apparatus of the present invention.
- FIG. 3 is a schematic representation of several cells of a sealed microcup-based, monochrome electrophoretic display apparatus of the present invention containing charged pigment particles dispersed in optically selective, right hand (R-) or left hand (L-) type of CLCs.
- FIG. 4A is a schematic representation of several cells of a sealed microcup-based, monochrome electrophoretic display apparatus of the present invention containing charged, optically selective, R- or L-type CLC particles in a contrast colored (black, “K”) dielectric solvent.
- the display as shown has a traditional up/down switching mode.
- FIG. 4B is a schematic representation of several cells of a sealed microcup-based, monochrome electrophoretic display apparatus of the present invention containing charged, optically selective, R- or L-type CLC particles in a colorless dielectric solvent.
- the display as shown has an in-plane switching mode.
- FIG. 5 is a schematic representation of several cells of a sealed microcup-based, monochrome display apparatus of the present invention comprising charged pigment particles dispersed in a colorless dielectric solvent and the display as shown has CLC color filters which selectively reflect R- or L-type of light such as red, green or blue back to the viewer.
- microcup refers to the cup-like indentations created by microembossing or imagewise exposure.
- cell in the context of the present invention, is intended to mean the single unit formed from a sealed microcup.
- the cells are filled with an electrophoretic dispersion which may be an optically active electrophoretic dispersion.
- microcups or cells when describing the microcups or cells, is intended to indicate that the microcup or cell has a definite shape, size and aspect ratio which are pre-determined according to the specific parameters of the manufacturing process.
- aspect ratio is a commonly known term in the art of electrophoretic displays. In this application, it refers to the depth to width or depth to length ratio of the microcups.
- FIG. 1 is a general depiction of an array of sealed microcup-based electrophoretic cells.
- the cells ( 10 ) are sandwiched between a top layer ( 11 ) and a bottom layers ( 12 ).
- the cells are filled with an electrophoretic dispersion and are also individually sealed with a sealing layer ( 13 ).
- the microcup-based cells may be prepared by microembossing or photolithography as disclosed in the co-pending U.S. applications, U.S. Ser. No. 09/518,488, filed on Mar. 3, 2000 (corresponding to WO01/67170), U.S. Ser. No. 09/759,212, filed on Jan. 11, 2001, U.S. Ser. No. 09/606,654, filed on Jun. 28, 2000 (corresponding to WO02/01280) and U.S. Ser. No. 09/784,972, filed on Feb. 15, 2001.
- the display may have the traditional up/down switching mode, the in-plane switching mode or the dual switching mode.
- the display having the traditional up/down switching mode or the dual switching mode there are a top transparent electrode plate, a bottom electrode plate and the individually sealed cells are enclosed between the two electrode plates.
- the up/down mode allows the charged particles to move in the vertical (up/down) direction
- the dual switching mode allows the particles to move in either the vertical (up/down) direction or the planar (left/right) direction.
- the cells are sandwiched between a top transparent insulator layer and a bottom electrode plate.
- the in-plane switching mode allows the particles to move in the planar direction only.
- FIGS. 2-5 details of the preferred embodiments are schematically shown in FIGS. 2-5 , with the understanding that the present disclosure is not intended to limit the invention to the embodiments illustrated.
- a display that can be used to decode 3-D information is made by enclosing within sealed microcup-based cells R- and L-types of CLCs or CLC particles that selectively reflect R- or L-type of red (“R”), green (“G”) or blue (“B”) light as shown in FIG. 2 .
- a sealed microcup-based electrophoretic display can be made and used as the display device of a variety of 3-D imagery systems as shown in FIG. 3 .
- the EPD comprises cells that contain charged pigment particles dispersed in optically selective CLCs.
- the charged particles can be either black or white (not shown), and the CLCs can be “R”(R-), “R”(L-), “G”(R-), “G”(L-), “B”(R-) or “B”(L-).
- the notations, “R”, “G”, “B”, (R-) and (L-) stand for red, green, blue, right hand type and left hand type, respectively, as conventionally used in the art.
- a sealed microcup-based EPD can be made and used as the display device of a variety of 3-D imagery systems as shown in FIGS. 4A and 4B .
- the EPD comprises cells that contain charged, optically selective, CLC particles dispersed in a dielectric solvent.
- Each cell of the display contains a type of CLC particle selected from the following: “R”(R-), “R”(L-), “G”(R-), “G”(L-), “B”(R-) or “B”(L-) CLC particles.
- the dielectric fluid may be colored such as black in the case of the conventional up/down switching mode ( FIG. 4A ) or colorless in the case of the in-plane switching mode ( FIG. 4B ).
- a color (such as black) background may be used as shown in FIG. 4B .
- a display comprising a multitude of sealed microcup-based cells can be made and used as the display device of a variety of 3-D imagery systems as shown in FIG. 5 .
- Each cell of the display contains charged, black or white pigment particles dispersed in a colorless dielectric solvent, and a CLC color filter which selectively reflects R- or L-type of light such as red, green or blue back to the viewer is placed with each cell, either on the cell bottom as shown in FIG. 5 , or at the top of the cell.
- FIG. 5 also shows the display driven by an in-plane switch mode. When the particles migrate to the sides of the cell, the viewer sees the R- or L-type of light from the optically selective colored background and hence a 3-D image. When the particles are dispersed in the cell, the viewer sees the color of the particles.
- the sealing of the microcup-based cells is disclosed in co-pending applications U.S. Ser. No. 09/518,488, filed on Mar. 3, 2000 (corresponding to WO01/67170), U.S. Ser. No. 09/759,212, filed on Jan. 11, 2001, U.S. Ser. No. 09/606,654, filed on Jun. 28, 2000 (corresponding to WO02/01280), and U.S. Ser. No. 09/784,972, filed on Feb. 15, 2001.
- the sealing of the microcups may be accomplished in a number of ways.
- a preferred approach is to disperse a UV curable composition into the electrophoretic dispersion which may be an optically active electrophoretic dispersion described above or an electrophoretic dispersion as disclosed in U.S. Ser. No.
- the UV curable composition which may contain a multifunctional acrylate, an acrylated oligomer and a photoinitiator is immiscible with the electrophoretic dispersion and has a specific gravity lower than that of the electrophoretic dispersion.
- the two components, UV curable composition and the electrophoretic dispersion are thoroughly blended in an in-line mixer and immediately coated onto the microcups with a precision coating mechanism such as Myrad bar, gravure, doctor blade, slot coating or slit coating. Excess fluid is removed by a wiper blade or a similar device.
- a small amount of a weak solvent or solvent mixture such as isopropanol, methanol or an aqueous solution mixture thereof may be used to clean the residual electrophoretic dispersion on the top surface of the partition walls of the microcups.
- Volatile organic solvents may be used to control the viscosity and coverage of the electrophoretic dispersion.
- the thus-filled microcups are then dried and the UV curable composition floats to the top of the electrophoretic dispersion.
- the microcups may be sealed by curing the supernatant UV curable layer during or after it floats to the top. UV or other forms of radiation such as visible light, IR and electron beam may be used to cure the composition and seal the microcups.
- heat or moisture may also be employed to seal the microcups, if appropriate heat or moisture curable compositions are used.
Abstract
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US10/841,122 US7408696B2 (en) | 2000-03-03 | 2004-05-07 | Three-dimensional electrophoretic displays |
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US09/518,488 US6930818B1 (en) | 2000-03-03 | 2000-03-03 | Electrophoretic display and novel process for its manufacture |
US32217301P | 2001-09-13 | 2001-09-13 | |
US10/243,280 US20030048522A1 (en) | 2001-09-13 | 2002-09-12 | Three-dimensional electrophoretic displays |
US10/841,122 US7408696B2 (en) | 2000-03-03 | 2004-05-07 | Three-dimensional electrophoretic displays |
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US09/518,488 Continuation-In-Part US6930818B1 (en) | 2000-01-11 | 2000-03-03 | Electrophoretic display and novel process for its manufacture |
US10/243,280 Continuation-In-Part US20030048522A1 (en) | 2000-03-03 | 2002-09-12 | Three-dimensional electrophoretic displays |
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US8282762B2 (en) | 2001-01-11 | 2012-10-09 | Sipix Imaging, Inc. | Transmissive or reflective liquid crystal display and process for its manufacture |
US8456589B1 (en) | 2009-07-27 | 2013-06-04 | Sipix Imaging, Inc. | Display device assembly |
US8797633B1 (en) | 2009-07-23 | 2014-08-05 | Sipix Imaging, Inc. | Display device assembly and manufacture thereof |
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